Construction quadropter

De Breizh-Entropy
Révision datée du 29 février 2012 à 13:36 par Wluce0 (discussion | contributions) (Created page with "see also: http://hackerspaces.org/wiki/OccuCopter == Goals == If we intend to build an Occucopter for Syria, we have to work on the following points: * Should it record locally ...")
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see also: http://hackerspaces.org/wiki/OccuCopter

Goals

If we intend to build an Occucopter for Syria, we have to work on the following points:

  • Should it record locally the video so that it is fetched later, or should it livestream using WiFi or 3G? / both
  • Is it possible have night videos?
  • What about balloons? It seems they are not cheap and require to be large in order to be stable enough.

Flying device

Quadri?/Tri?/Bi?

Avoid being shot down

  • Reduce apparent surface
  • Use "octopuss ink" strategy: diffuse smoke in case it is prone to attacks and back without being seen

Behaviour

Should the flying device be

- radiocommanded

- use pre-configured GPS coordinates?

- track & follow

- Hybrid mode: RC controlled with automatic backup strategy

Communication

Communication / No communication ?

Sat/GSM/3G/IR/WiFi/other ?

no relay / relay / relays

WiFi is weak for transmitting videos on long distances

4channels emitter: http://www.topmodel.fr/product-detail-15375-micro-rx-xpower-z-synthzse-rp4s1-41mhz

Avoid tracking: sparse communication

GPS: What about signal accuracy there? GPS Spoofing: the copter may not be very exposed to this kind of attack

DVB-T Broadcasting using a hacked video card: http://bellard.org/dvbt/

Mainboard & flight control

  • servocontroling
  • gps?
  • video encoding?
  • sd card?
  • usb?

Video aquisition

Night mode: IR module cannot be used: they need IR illumination (not realistic on RC models) Thermal Imaging Module -> found prices >1000$ :/

http://www.opticsplanet.com/s/thermal+camera/pg~3_sort~price-asc

http://www.amazon.com/Thermal-Eye-4525AS-Degree-FOV/dp/B0048JWHBY

http://www.nightvision4less.com/l3-thermal-eye-x-200-thermal-monocular.aspx

Camera stabilisation

Use a birotor drone with camera below

Gyroscopic camera demo:

http://www.youtube.com/watch?v=Slx0EmJo85c

Simpler / cheaper solution: (no drift, using IR horizon)

Not to do

Crappy video stream : http://www.youtube.com/watch?v=kleXRRpx2Ac

Hardware

In our Possession

  • 2-3 Arduino's, commandable through character device through USB cable
  • One WiFi controller Rovinc WiFly RN-131C pluggable on the Arduino
  • One micro camera (see technical description)
  • Crappy 4 digital channel RC emitter/receiver

Still Required

  • Motors
  • Helixes
  • WiFi antennas and/or Radio Frequency transmitters
  • GPS
  • Batteries

Bibliography

Bunch of infos on copters: